1// HP/SGI iterator extensions -*- C++ -*-
2
3// Copyright (C) 2001, 2002 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 2, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING.  If not, write to the Free
18// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
19// USA.
20
21// As a special exception, you may use this file as part of a free software
22// library without restriction.  Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License.  This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30/*
31 *
32 * Copyright (c) 1994
33 * Hewlett-Packard Company
34 *
35 * Permission to use, copy, modify, distribute and sell this software
36 * and its documentation for any purpose is hereby granted without fee,
37 * provided that the above copyright notice appear in all copies and
38 * that both that copyright notice and this permission notice appear
39 * in supporting documentation.  Hewlett-Packard Company makes no
40 * representations about the suitability of this software for any
41 * purpose.  It is provided "as is" without express or implied warranty.
42 *
43 *
44 * Copyright (c) 1996-1998
45 * Silicon Graphics Computer Systems, Inc.
46 *
47 * Permission to use, copy, modify, distribute and sell this software
48 * and its documentation for any purpose is hereby granted without fee,
49 * provided that the above copyright notice appear in all copies and
50 * that both that copyright notice and this permission notice appear
51 * in supporting documentation.  Silicon Graphics makes no
52 * representations about the suitability of this software for any
53 * purpose.  It is provided "as is" without express or implied warranty.
54 */
55
56/** @file ext/iterator
57 *  This file is a GNU extension to the Standard C++ Library (possibly
58 *  containing extensions from the HP/SGI STL subset).  You should only
59 *  include this header if you are using GCC 3 or later.
60 */
61
62#ifndef _EXT_ITERATOR
63#define _EXT_ITERATOR
64
65#pragma GCC system_header
66#include <bits/concept_check.h>
67#include <iterator>
68
69namespace __gnu_cxx
70{
71
72  // There are two signatures for distance.  In addition to the one taking
73  // two iterators and returning a result, there is another taking two
74  // iterators and a reference-to-result variable, and returning nothing.
75  // The latter seems to be an SGI extension.   -- pedwards
76  template<typename _InputIterator, typename _Distance>
77    inline void
78    __distance(_InputIterator __first, _InputIterator __last,
79	       _Distance& __n, std::input_iterator_tag)
80    {
81      // concept requirements
82      __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
83      while (__first != __last) { ++__first; ++__n; }
84    }
85
86  template<typename _RandomAccessIterator, typename _Distance>
87    inline void
88    __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
89	       _Distance& __n, std::random_access_iterator_tag)
90    {
91      // concept requirements
92      __glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
93      __n += __last - __first;
94    }
95
96  /**
97   *  This is an SGI extension.
98   *  @ingroup SGIextensions
99   *  @doctodo
100  */
101  template<typename _InputIterator, typename _Distance>
102    inline void
103    distance(_InputIterator __first, _InputIterator __last,
104             _Distance& __n)
105    {
106      // concept requirements -- taken care of in __distance
107      __distance(__first, __last, __n, std::__iterator_category(__first));
108    }
109
110} // namespace __gnu_cxx
111
112#endif /* _EXT_ITERATOR */
113
114